How do you completely delete a unit?

[RTW King]

I've been working on a mod and so far to get rid of old units I've just been giving them the no_custom attribute in export_descr_unit, and then removing them from buiding queues in export_descr_buildings. This works fine, but the game has a 500 unit limit, and these units are still taking up space, and I'm going to run out of space soon if I don't delete these unused units. Does anyone know how to completely delete a unit?

[Bwian]

Delete them from

Descr_model_battle
Export_descr_unit
Export_descr_unit_enums

and
export_units ( in the 'text' folder )

That, plus making sure you have removed them from the building unit lists and made sure there are no units of this type available to start with in the campaign.

[Monkwarrior]

check also descr_rebel_factions and descr_mercenaries.